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Non-symmetric structure grid velocity compensation method and velocity compensation-type bending coplane waveguide

A technology of coplanar waveguide and speed compensation, which is applied in the microwave field, can solve the problems of volume integration reduction and cost increase, and achieve the effect of reducing process and cost

Inactive Publication Date: 2007-09-19
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the erected air bridge and the coplanar waveguide are not on the same plane, the process of erecting the air bridge is added to the manufacturing process, and the cost also increases, and from the perspective of integration, the increase in volume leads to a decline in integration.

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  • Non-symmetric structure grid velocity compensation method and velocity compensation-type bending coplane waveguide
  • Non-symmetric structure grid velocity compensation method and velocity compensation-type bending coplane waveguide
  • Non-symmetric structure grid velocity compensation method and velocity compensation-type bending coplane waveguide

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Embodiment 1

[0037] Embodiment 1: As shown in Figure 1, Figure 1 shows the structure and parameters of the coplanar waveguide grating structure. Different coplanar waveguide grating structures can be obtained by changing its structural parameters. It can be seen from Figure 1 that k 1 and k 2 are the propagation constants of the electromagnetic wave on the non-grid structure and the grid structure, respectively. In order to prove the change of the grid structure to the propagation speed of electromagnetic waves and understand the effect of different structures, the k 2 k 1 ratio, as shown in Table 1. The specific structure is set as follows: w c = 0.25mm, w g = 1 mm, w s = 0.1mm, t = 0.0625mm, ε r =12.9, Z c =50Ω. Among them, Z c is the characteristic impedance of the coplanar waveguide. It can be seen from the table that k 2 / k 1 Both are greater than 1, indicating that the grid structure does have a slow wave effect.

[0038] Table 1 Propagation constant ratio of different ...

Embodiment 2

[0043] Embodiment 2: As shown in FIG. 2 , a rectangular grid velocity compensation curved coplanar waveguide.

[0044] When the grid structure in Table 1 is specifically applied to a discontinuous coplanar waveguide, the slot with a shorter path on the coplanar waveguide should be set as a grid structure. Taking the 90° curved coplanar waveguide as an example to illustrate the specific implementation, since the path length of the outer slot is greater than that of the inner slot, the inner slot should be made into a grid structure. Figure 2 shows the structure and parameters of the 90° curved coplanar waveguide grating structure.

[0045] Formulas (1) and (2) give the calculation formulas for determining the grid length (the parameters in the formula are shown in Table 1):

[0046] k 2 S=k 1 (S+ΔS) (1)

[0047] S = ΔS k 2 ...

Embodiment 3

[0052] Embodiment 3: As shown in FIG. 3 , a deformed grid velocity compensation type 90° arc-shaped curved coplanar waveguide structure.

[0053] Since the structure is arc-shaped at the bend, the grid structure changes accordingly, forming a deformed grid.

[0054] Numerical calculation results

[0055] The 90° curved coplanar waveguides with grid structure types A1, C3, D2 and D3 are analyzed and calculated by simulation software, and some numerical calculation results are obtained. The specific structural settings are as follows: L=7.65mm; C3: S=4.7mm; D2: S=3.1mm; D3: S=4.925. Other structural parameters are shown in Table 1. Figure 8 and Figure 9 show the S of these four structures respectively 11 , S 21 The magnitude of the parameter varies with frequency. It can be seen from Figure 8 and Figure 9 that the reflection coefficient S 11 reduced, the transmission coefficient S 21 It increases in the higher frequency region, indicating that the transmission performance...

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Abstract

The invention provides a speed compensation method for asymmetric structure grid, which employs the regular gate structure and deformation gate structure which periodically or quasi-periodically change in different slot width along axes as basic slow--wave structure to calculate the length and period of the gate structure. The slot having shorter route on discontinuous coplanar waveguide is set as gate structure according to the length and period of the gate structure. For speed compensation bending coplanar waveguide, the outer slot structure thereof is no changed, and the inner slot width periodically changes along axes to form grid; The slot of the bending waveguide having shorter route is made into a slot with gate structure thereby slowing the propagation speed of the electromagnetic wave on the route, thus, the phases of the two route become similar after passing the bending structure, then the signal can keep synchronization in time. The structure can be directly executed grid processing on the floor of the coplanar waveguide and the signal line, so can be directly achieved in the procedure for making the coplanar waveguide without increasing original circuit volume, thus, is fit for batch production of printed circuit.

Description

technical field [0001] The invention relates to a speed compensation method of an asymmetric structure grid and a speed compensation type curved coplanar waveguide, belonging to the microwave technology field in electronic science and technology. Background technique [0002] Coplanar waveguides have the advantages of easy series-parallel connection, low radiation, low dispersion, and easy integration, so they are widely used in monolithic microwave integrated circuits. However, since the coplanar waveguide structure contains two slots as transmission paths, when the coplanar waveguide structure is bent, the lengths of the two slots will be unequal, so there will be a phase difference after the electromagnetic wave passes through the two slots. The performance is that the signals in the two gaps are no longer synchronized, resulting in large electromagnetic wave reflection, radiation, signal dispersion, broadening, etc., which is not conducive to energy transmission, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P3/14H01P3/12H01P3/00
Inventor 王均宏
Owner BEIJING JIAOTONG UNIV
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